TestPresenter.php

<?php

use Nette\Application\AppForm;

class TestPresenter extends Nette\Application\Presenter
{

	public function renderDefault()
	{
		$this['test']->render();
	}
	
	protected function createComponentTest()
	{
		$form = new AppForm($this, 'test');
		
		$form->addText('txt', 'text')
				->addRule(AppForm::INTEGER, 'Not a number')
				->addRule(function ($control) {
					return strlen($control->value) > 3;
				}, 'Not long enough');
		$form->addSubmit('s', 'send');
		
		$form->onSubmit[] = function ($frm) {
			dump($frm->values);
		};
	}

}